Bark-mill



(No Model.) 2 Sheets-Sheet 1.

B. OTT.

BARK MILL. No. 340,922. Patented Apr. 27, 1886.

WITNESSES INVENTOR ATTORNEYS.

(No Model.) 2 Sheets-Sheet 2.

B. OTT.

BARK MILL.

No. 340,922. Patented Apr. 2'], 1886.

WITNESSES: I INVENTOR:

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N PETERS, Pholo-Lllllogmphcr. Washington. I C- UNITED STATES PATENTOFFICE.

BEJEDIOT OTT, OF LA CROSSE, VISCONSIN.

BARK-MILL.

SPECIFICATION forming part of Letters Patent No. 340,922, dated April27, 1886.

Application filed December 2, 1885. Serial No. 184,514.

To all whom it" may concern:

Be it known that I, BENEDICT O'r'r, of La Orosse, in the county of LaOrosse and State of Wisconsin, have invented a new and usefulImprovement in Bark-Mills, of which the following is a description.

This invention is an improvement in barkmills, and relates especially tothat class of such machines in which the bark is rapidly revolved by acarrier operating within a cylinder supplied with radial openings andcutters.

The invention consists in certain features of construction andcombination of parts, as will be hereinafter described and claimed.

In the drawings, Figure l is a side elevation of my machine, the casingbeing in section and part of the hopper broken away. Fig. 2 is avertical section of the mill. Fig. 3 is a transverse section through thecasing and part of the cutter-cylinder. Fig. 4 is a top plan view of thehopper and the upper bearing of the shaft. Fig. 5 is a broken detachedplan and sectional view of the carrier and the cuttercylinder.

The main frame is shown as composed of a base-plate, A, mounted on asupport, a top plate, B, and uprights 0, set between the base and topplates. These uprights are preferably secured between radial lugs D,projected from the top and bottom plates, and are formed with sides setat inclines diverging outwardly, so as to admit the cylinder-sections,presently to be described, and present but little obstruction to thepassage of the bark out of the cylinder. I also form these uprightshollow, thereby combining lightness and strength, and usually open attheir outer sides, as shown at 0, Figs. 1 and 3, to permit theconvenient placing of the bolts, presently to be described. Bolts orrods E ext-end between the top and base plates and through the uprights0, connecting such part-s firmly, and yet so they may be easily detachedwhen desired.

The lugs D of the bottom plate, it will be seen, rest upon the support,which has an opening, as shown in Fig. 2, through which the cut barkreceived from the mill passes down to a receiver, in which I usuallyarrange one end of an elevator for raising the shavings to any suitablepoint. At their inner edges the bottom and top plates, A and B, areformed (No model.)

with shoulders a and b, projecting, respect ively, up and down, andserving as stops, against which to abut the cylinder-sections, presentlyto be described.

The cylinder may be of even bore or tapering, as desired, and is formedin segmental sections F-usually four, as shownand provided with radialopenings and with knives secured therein, as shown in Figs. 1, 3, and 4.These sections .abut at their inner ends against the shoulders a and b,by which they may be quickly and accurately set to position, and theyare each usually secured at each end by pins or bolts f, passed throughthe top and bottom plates, f f", of the section into the top and bottomplates of the main frame, or, where desired, keys may be employed tosecure such parts. By detaching one end of a section it may be swungopen to permit access to the interior of the mill, in order to clean outthe same, remove obstructions, or for any other desired purpose.Another-and important advantage in this construction is that by it thecylinder may be removed and another substituted in its place withoutaffecting the other parts of the machine. A mill can thus be suppliedwith two sectional cylinders and be run practically all the time, as onecylinder may be repaired while the other is in use.

I prefer to form the sections alike, so that v in some instances oneextra section may be furnished,the cylinder repaired,and the knivessharpened by substituting such extra section for one of the regularsections while repairing the latter. I usually rabbet the inner edges ofthe sections where they abut against shoulders a b, to form a close fit,as shown most clearly in Fig. 2.

The base-plate Ais provided centrally with abearing, G, for thecarrier-shaft, which hearing may be provided with quarter-boxes g,adjustably secured by set-screws, as shown. The shaft H'has its lowerend stepped in the bearing G. On this shaft I secure thev carrierplateI. The shaft and the plate form the carrier, to which is secured thepresser or pressers J. This presser is formed with wings K and L, and ispreferably provided with a rearwardly-extended base-flange, j, toreceive the bolts by which it is secured to the carrierplate. The wingK, I call the divisionwin'g, and it extends approximately radial .themain frame.

to the carrier-shaft, and the wing -L projects from the outer end of thedivision-wing at about a right angle and rearwardly with reference tothe line of motion. This wing is also inclined or tapered rearwardlyfrom its upper to its lower side, as most clearly shown in Figs. 3 and5. The outer end of wing L, it will be seen, moves close to the knives,and the arrangement thereof is such that a long wedge-like space isformed between said wing and the cutter-cylinder, so that each presser,of which I usually use three, will be pressing the bark against severalknives at the same instant, thus greatly increasing the capacity of themachine. The lower end of the shaft being stepped in bearing G, it isfurther supported in bearing M, which is preferably supported in thehopper but manifestly might be a part of the top plate, B.

The hopper N is divided longitudinally into two segmental sections,which are detachably joined, usually by bolts, as shown. At its lowerend the hopper is formed with a flange, n, bolted or otherwisedetachably joined to The bearing M is formed by two frames, m, eachsecured to one of the sections of the hopper and provided withhalfbearings, which coincide when the hopper is closed and form abearing for the shaft above the main frame. By this sectional formationof the hopper one section may be opened to permit access to the interiorof the mill,as may be desired. Interlapping breakers O and P aresecured, respectively, to the shaft and the hopper, and operate tocompletely disintegrate the bark and put the same into proper condi tionfor the cutters or knives.

A case, Q, is placed over the main frame of the machine. This case maybe formed in sections and slipped over the machine from opposite sidesor be otherwise suitably formed,

its function being to prevent the cut bark from being spread laterallyand force such bark to discharge through the openings provided for itbetween the lugs D of the base-plate A.

In operation the bark is broken in small pieces in the hopper by thebreakers, and passes thence onto the carrier, where it is forced ontothe knives and cut into shavings, as will be clearly understood from thepreceding description.

Having thus described my invention, what I claim as new is r 1. Thecombination, with the shaft and the main frame having a bearing for thelower end thereof, of the hopper divided longitudinally into sections,and frames connected one with each of said sections, each of said framesbeing provided with a segment of a bearing for the shaft, substantiallyas set forth.

2. The combination, with the top and base plates, ofthe uprights placedbetween them and having their sides formed in lines diverging outwardly,the cutter-cylinder sections, and the carrier, substantially as setforth.

3. The combination, with the cutter-cylinder, the carrier-plate, and theshaft, ofapresser provided with a base-flange rested on said plate, andfastening-bolts passed through said flange into the plate, substantiallyas set forth.

4. The combination, with the top and bottom plates, of thecutter-cylinder sections and the boltsf connecting said sections at ornear their ends with said plates, whereby by releasing one end of saidsections they may be turned on the bolts at the opposite ends as onpivots, substantially as set forth.

BENEDICT OTT.

Vitnesses:

A. STEINLEIN, H. J. PEOK.

